3-Alkynylacyl cyanides or 3-alkynylacids and their esters can be obtained by a conjugate addition of alkynylsilanes to α,β-ethylenic acyl cyanides.
3-炔基氰基氰化物或3-炔基酸及其酯可通过将炔基硅烷共轭加成到α,β-乙烯酰基氰化物上而获得。
Synthesis of Tropane Alkaloids via Enantioselective Deprotonation of Tropinone
作者:Marek Majewski、Ryszard Lazny
DOI:10.1021/jo00123a018
日期:1995.9
Enantioselective deprotonation of tropinone 2 with chiral lithium amides 5a and 6a, in the presence of LiCl, gave tropinone lithium enolate in up to 95% ee. The C-2 symmetrical lithium amide 6a worked best when it was generated in situ from the hydrochloride salt of the corresponding amine 6b. The deprotonation was used as the key step in synthesis of tropane alkaloids: ent-anhydroecgonine, ent-knightinol, KD-B, chalcostrobamine, ent-isobellendine, and ent-darlingine. The absolute configuration of natural benzyltropane and pyranotropane alkaloids was established (by correlation with anhydroecgonine) to be 'cocaine-like' i.e., the side chain originates at C-2 of the tropane ring system in all cases.
Normant,J.F.; Piechucki,C., Bulletin de la Societe Chimique de France, 1972, p. 2402 - 2403
作者:Normant,J.F.、Piechucki,C.
DOI:——
日期:——
Facile Hetero-Diels-Alder Reaction of ?,?-Unsaturated Acyl Cyanides and Enol Ethers: Syntheses of 2-Alkoxy-3,4-dihydro-2H-Pyran-6-carbonitriles
作者:Robert A. John、Vincent Schmid、Hugo Wyler
DOI:10.1002/hlca.19870700313
日期:1987.5.6
2-Ethoxy-3,4-dihydro-2H-pyran-6-carbonitriles are obtained in high yield by stereospecific endo-mode cyclo-additions of α,β-unsaturated acyl cyanides and ethyl vinyl ether at room temperature. The nitrile group is converted to some other functionalities.
α,β‐Unsaturated acylcyanides are key bis‐electrophile substrates for successful domino enantioselectiveorganocatalyzed Michael‐intramolecular acylation domino sequences. This new reactivity has been applied to the synthesis of enantioenriched azaspiro[4,5]decanone ring systems by a formal [3+3]spiroannulation, constituting a rare example of synthesis of glutarimides in an optically active form.